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Method of cluster computer for simulating electromagnetic wave propagation

An electromagnetic wave and computer technology, applied in the field of electromagnetic wave propagation, can solve problems such as rough grid points, increasing the number of simulation iteration steps, and large numerical dispersion errors

Inactive Publication Date: 2010-07-07
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

For the electromagnetic wave propagation simulation of point source excitation, it is usually necessary to use a spatially extended source to approximate the point source excitation, which cannot accurately reflect the real simulation environment
[0006] (2) In many electromagnetic wave propagation simulations (such as the simulation of light wave propagation in biological tissue), the number of variables is quite large, far exceeding the memory capacity of a single processor, and the simulation time will exceed the acceptable range
This fact makes it impossible for existing time-domain pseudospectral methods of electromagnetic fields to be efficiently parallelized on distributed memory cluster computers to simulate large-scale electromagnetic wave propagation.
[0007] (3) The time differential calculation of the electromagnetic field time-domain pseudospectrum method adopts the second-order precision difference scheme, and when the time step is not small enough, it will cause a large numerical dispersion error
Usually, it is necessary to select a time step that is much smaller than the stability condition in the calculation, which undoubtedly increases the number of iterations required for the simulation.
[0008] (4) The grid points used in the electromagnetic field time-domain pseudospectrum method are rough, so the error is relatively large when the equivalent surface current is numerically integrated on the closed surface in the near-field extrapolation and far-field program for obtaining the far-field electromagnetic field distribution

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  • Method of cluster computer for simulating electromagnetic wave propagation
  • Method of cluster computer for simulating electromagnetic wave propagation
  • Method of cluster computer for simulating electromagnetic wave propagation

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Embodiment 1

[0168] In this embodiment, the polarization characteristics of backscattered light are studied when polarized light is incident on a biological tissue model, so as to provide parameters for the polarization gating technology in optical detection of biological tissue. The biological tissue model uses a discrete scatterer model, such as Figure 7 As shown, that is, in a certain space volume range (l x × l y × l z ) medium microspheres of uniform size are randomly distributed. The radius of the microsphere is 1 μm, and the refractive index is 1.59; the space outside the microsphere is water, and the refractive index is 1.33. The incident light is a plane wave linearly polarized in the x direction input along the z direction, and its wavelength in free space is 785nm.

[0169] In this embodiment, four groups of tissue models of different sizes were simulated. The spatial dimensions of each group of models, the number of microspheres in the model, the width of the grid during c...

Embodiment 2

[0191]The embodiment 2 simulates and calculates the enhanced backscattering phenomenon when the light wave is incident on the biological tissue model. The construction method of the biological tissue model in this embodiment is consistent with the construction method of the biological tissue model in Embodiment 1, and each parameter is the same as that of the second group of models in Embodiment 1. In this embodiment, in order to suppress the speckle generated by the coherent light and the biological tissue model, the results of incident light of different frequencies are averaged.

[0192] Figure 10 It is the flow chart of the present embodiment 2:

[0193] (1) Generate tissue model: randomly generate microsphere positions within a limited space to ensure that all microspheres do not overlap each other and are evenly distributed in space;

[0194] (2) set i=1;

[0195] (3) Calculate the incident light frequency of the ith simulation: f i =(0.95+0.005(i-1))f 0 , where f ...

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Abstract

The invention relates to a method of a cluster computer for simulating electromagnetic wave propagation. The method comprises the following steps of: dispersing an electromagnetic wave propagation space into three-dimensional grids, dividing a simulation area into blocks by using an overlapping area disassembly method and constructing model data files; reading the corresponding model data files by each computation node of the cluster computer respectively, simulating the electromagnetic wave propagation by using a parallel electromagnetic field time-domain pseudo-spectrum method and outputting a file recording the steady-state distribution of an electromagnetic field in a space; and obtaining the distribution of a far-field scattered field by utilizing a near-field extrapolation far-field program. Compared with the traditional method, the invention has the following advantages that: the method can be used for simulating the electromagnetic wave propagation of point-source excitation; the large-scale electromagnetic wave propagation can be efficiently simulated in parallel; the iteration frequency in the simulation is reduced; and the far-field result is more accurate.

Description

technical field [0001] The invention relates to electromagnetic wave propagation, in particular to a method for simulating electromagnetic wave propagation by a cluster computer. Background technique [0002] Using numerical methods to accurately simulate the propagation of electromagnetic waves is crucial to understanding the laws of the interaction between electromagnetic waves and various complex media and shortening the development cycle of electromagnetic products. The existing simulation methods mainly include the moment method, the electromagnetic field time-domain finite difference method and the electromagnetic field time-domain pseudo-spectrum method. [0003] Among the various methods mentioned above, the electromagnetic field time-domain pseudospectrum method was proposed by Q.H.Liu in 1997 (Microwave and optical technology letters, volume: 15, pages: 158-165, 1997), which is more suitable for large-scale electromagnetic waves Simulation of propagation. This me...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 丁明陈昆
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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